Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....of spurts and gaps allows for silence suppression, where a voice segment is transmitted only if it is detected as active (a talk spurt) The main benefits of silence suppression are: allows higher bandwidth utilization through multiplexing. allows per spurt playout delay adjustment [17] [14]. enable echo suppression based on silence detector output. We are mainly interested in how much bandwidth utilization gain can be achieved by multiplexing, and what packet loss rate is introduced by the multiplexer for a particular utilization gain. Previous studies on the performance of ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

....media content and transmit it via the network as packets at regular intervals. The receiver gets the media packets and schedules an appropriate playout time in order to produce a smooth output media stream. It compensates for the delay variation (jitter) using a playout delay adjustment algorithm [7, 16, 14, 3, 2]. Simple algorithms use a xed playout delay, either static or determined at the start of a session. More advanced VoIP applications compute a di erent playout delay for each talk spurt [4] adaptively according to the current network condition. The quality of multimedia applications is primarily ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

....of all packets form a line y = x 13. An alternative de nition of playout delay is the delay between sending time and playout time. The reader can choose either of the two de nitions as long as its meaning is clear. Many techniques have been developed for controlling playout delay [13] 36] [28] [7] 6] etc. Simple ones use a xed playout delay, either static or determined at the start of a session. More advanced techniques exploit the existence of talk spurts (speech) and pauses (silence) 8] in human speech. The length distribution of talk spurts and pauses depends on silence detector ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995. 23

....of spurts and gaps allows for silence suppression, where a voice segment is transmitted only if it is detected as active (a talk spurt) The main benefits of silence suppression are: # allows higher bandwidth utilization through multiplexing. # allows per spurt playout delay adjustment [17] [14]. # enable echo suppression based on silence detector output. We are mainly interested in how much bandwidth utilization gain can be achieved by multiplexing, and what packet loss rate is introduced by the multiplexer for a particular utilization gain. Previous studies on the performance of ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

....is to let the application have a playout buffer that adapts to changes in delay and delay variation. This allows interactive applications to suffer from a minimal delay for a specified loss rate. Several studies have been made to construct optimal algorithms for adaptive buffers [Ramjee 94, Moon 95] In general, the best way to combat transient losses are to apply techniques for packet repair as described in the next chapter, while long term losses require bandwidth adaptation [Kouvelas 98] The latter will be discussed in chapter four. A possible extension is to also support balancing of ....

S. Moon, J. Kurose, D. Towsley, "Packet audio playout delay adjustment algorithms: performance bounds and algorithms", Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

....times of all packets form a line # = # 13. An alternative de nition of playout delay is the delaybetween sending time and playout time. The reader can choose either of the two de nitions as long as its meaning is clear. Many techniques have been developed for controlling playout delay [13] 36] [28][7] 6] etc. Simple ones use a xed playout delay, either static or determined at the start of a session. More advanced techniques exploit the existence of talk spurts (speech) and pauses (silence) 8]inhuman speech. The length distribution of talk spurts and pauses depends on silence detector ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, Universityof Massachusetts at Amherst, Amherst, Massachusetts, August 1995. 23

....timing requirements, leading to the appearance of loss. This problem is more acute for interactive applications: if interactivity is unimportant a large playout delay may be inserted to allow for these delayed packets. This problem and algorithms for playout buffer adaption are studied further in [2, 25, 32]. Media Specific Forward Error Correction Media Independent Passive Interleaving Active Retransmission Sender Based Repair Figure 3: A Taxonomy of Sender Based Repair Techniques Unlike other communications media, IP multicast allows for the trade off between quality and interactivity to be made ....

S. B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

....far have inserted or removed delay at the beginning of talkspurts. This decision is based on the observation that silence periods in speech can be extended or contracted without significant impact on perceived speech quality. To date, these algorithms have all been ad hoc. Attempts have been made [56] to develop some kind of theory or bounds on the performance of such algorithms, but with limited success. We believe that there is room for additional theoretical and practical work in this area. In particular, we believe that adaptation of playout buffers need not occur only at the beginning of ....

S. B. Moon, J. Kurose, and D. Towsley, "Packet audio playout delay adjustment algorithms: performance bounds and algorithms," research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, Aug. 1995.

....Our study also highlights our current state of ignorance about how the perceived performance of audio and video applications depend on the underlying network dynamics. We hope that by clarifying the gaps in the current understanding future work can begin closing them. 6 Some work, such as in [8, 10], do analyze different adaptation algorithms, but their purpose was to refine the adaptation algorithm, not ask what implication adaptation had for network design. The remainder of this paper is organized as follows. Section 2 describes the class of applications we consider in this paper, and ....

....suggests that multiple service levels may be worth deploying according to this criterion. 4 Discussion Previous studies of application adaptivity have compared algorithms, focusing on such performance measures as the percentage of late packets for a given packet stream and adaptation algorithm. [8, 10] We believe ours is the first study to incorporate this adaptive behavior into consideration of a network design question. Our study provides no definitive answer to the question of whether multiple service priorities should be provided for real time traffic in the Internet. Our results showed ....

Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

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Sue B. Moon, Jim Kurose, and Don Towsley. Packet audio playout delay adjustment algorithms: performance bounds and algorithms. Research report, Department of Computer Science, University of Massachusetts at Amherst, Amherst, Massachusetts, August 1995.

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S. B. Moon, J. Kurose, and D. Towsley, "Packet audio playout delay adjustment algorithms: performance bounds and algorithms," Res. rep., Dept. of Comp. Sci., Univ. of MA at Amherst, Aug. 1995.

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